package com.ygg.listener;

import cn.hutool.core.bean.BeanUtil;
import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.read.listener.ReadListener;
import com.alibaba.excel.util.ListUtils;
import com.ygg.model.cmn.Dict;
import com.ygg.service.DictService;
import com.ygg.vo.cmn.DictEeVo;
import lombok.extern.slf4j.Slf4j;

import java.util.List;
import java.util.stream.Collectors;

@Slf4j
public class DictListener implements ReadListener<DictEeVo> {

    private DictService dictService;

    public DictListener(DictService dictService) {
        this.dictService = dictService;
    }

    /**
     * 每隔5条存储数据库，实际使用中可以100条，然后清理list ，方便内存回收
     */
    private static final int BATCH_COUNT = 100;
    /**
     * 缓存的数据
     */
    private List<DictEeVo> cachedDataList = ListUtils.newArrayListWithExpectedSize(BATCH_COUNT);

    @Override
    public void invoke(DictEeVo dictEeVo, AnalysisContext analysisContext) {
        cachedDataList.add(dictEeVo);
        // 达到BATCH_COUNT了，需要去存储一次数据库，防止数据几万条数据在内存，容易OOM
        if (cachedDataList.size() >= BATCH_COUNT) {
            saveData();
            // 存储完成清理 list
            cachedDataList = ListUtils.newArrayListWithExpectedSize(BATCH_COUNT);
        }
    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {
        // 这里也要保存数据，确保最后遗留的数据也存储到数据库
        saveData();
        log.info("所有数据解析完成！");
    }

    /**
     * 加上存储数据库
     */
    private void saveData() {
        log.info("{}条数据，开始存储数据库！", cachedDataList.size());
        List<Dict> dicts = cachedDataList.stream().map(k ->
                BeanUtil.copyProperties(k, Dict.class)
        ).collect(Collectors.toList());
        dictService.saveBatch(dicts);
        log.info("存储数据库成功！");
    }
}
